1. Secure spread spectrum watermarking for images, audio and video;Cox,1996
2. Techniques for data hiding;Bender,1995
3. A digital watermark;Van Schyndel,1994
4. Embedding robust labels into images for copyright protection;Zhao,1995
5. Watermarking digital images for copyright protection;Ruandaidh;IEE Proc.-Vision Image Signal Process.,1996